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How many passwords are there of length 6 through 8 consisting of uppercase letters and digits, where there is at least one digit?

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  1. 13 October, 14:27
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    The easiest way to count the acceptable passwords is to note that there are 36^6 six-character strings made up of upper-case letters and digits, and 26^6 of them are made up entirely of letters, so there are 36^6-26^6 that include at least one digit
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